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63 papers · 1 filter
VHE Gamma-Ray Induced Pair Cascades in the Radiation Fields of Dust Tori of AGN: Application to Cen A
Parisa Roustazadeh, Markus Boettcher
The growing number of extragalactic high-energy (HE, E > 100 MeV) and very-high-energy (VHE, E > 100 GeV) gamma-ray sources that do not belong to the blazar class suggests that VHE…
What a Two Solar Mass Neutron Star Really Means
James M. Lattimer, M. Prakash
The determination of neutron star masses is reviewed in light of a new measurement of 1.97 M for PSR J1614-2230 and an estimate of 2.4 M for the black widow pulsar.…
Electromagnetic production of hyperon resonances
K. Hicks, D. Keller, W. Tang
The study of hyperon resonances has entered a new era of precision with advent of high-statistics photoproduction data from the CLAS detector at Jefferson Lab. These data have mult…
Near-threshold Photoproduction of Phi Mesons from Deuterium
X. Qian, W. Chen, H. Gao +144
We report the first measurement of the differential cross section on -meson photoproduction from deuterium near the production threshold for a proton using the CLAS detector and…
Variability in Quasar Broad Absorption Line Outflows I. Trends in the Short-Term versus Long-Term Data
Daniel M. Capellupo, Fred Hamann, Joseph C. Shields +2
Broad absorption lines (BALs) in quasar spectra identify high velocity outflows that likely exist in all quasars and could play a major role in feedback to galaxy evolution. The va…
Spectral Energy Distribution of Markarian 501: Quiescent State vs. Extreme Outburst
The VERITAS Collaboration, V. A. Acciari, T. Arlen +225
The very high energy (VHE; E > 100 GeV) blazar Markarian 501 has a well-studied history of extreme spectral variability and is an excellent laboratory for studying the physical pro…